_:vb50947979 . _:vb50947979 "url:http://en.wikipedia.org/wiki/Pericardial_effusion"^^ . _:vb50947979 . _:vb50947979 . _:vb50947979 "A pericardium disease that is characterized by an abnormal accumulation of fluid in the pericardial cavity."^^ . _:vb50947979 . _:vb50947979 .